<div class="control-group">
  <label class="control-label" for="input03">Multicon-select</label>
  <div class="controls">
    <select multiple="multiple" id="input03" class="span12">
      <option>1</option>
      <option>2</option>
      <option>3</option>
      <option>4</option>
      <option>5</option>
    </select>
  </div>
</div>
